Table 1 Optical properties, frontier energy levels, and simulated results of PY-BO and tetramer 4Y-BO

From: Polymer-like tetramer acceptor enables stable and 19.75% efficiency binary organic solar cells

Acceptor

Molecular weight

λmax (nm)

Egopt

εfilm

HOMO/LUMO

λint,e

λint,h

VIE

(kDa)

solution

film

(eV)

(105 cm−1)

(eV)CV

(meV)

(meV)

(meV)

PY-BO

9.96

795

807

1.41

1.13

− 5.55/− 3.80

28.50

41.72

6008

4Y-BO

7.36

765

804

1.41

1.31

− 5.61/− 3.83

27.38

40.91

6048

  1. λmax represents the wavelength of the absorption peak. Egopt calculated from the onset wavelength of the film absorption spectra. εfilm represents the maximum extinction coefficient of the films. HOMO/LUMO levels obtained from CV measurements. λint,e and λint,h represent electron and hole internal reorganization energy, respectively. VIE represents vertical ionization energy.
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